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Hi:You may have a problem with the inverters in the unit, they are responsible for lighting up the back panel. Check or have checked the power supply voltage to the inverters, should be around 18-24 volts DC. Also leaky capacitors on the power supply will cause this issue as well as leaky or puffy capacitors on the inverter.

Ghosting or blurring vision happens due to a faulty video processing board. It may be due to faulty T-con board (BN81-01308A) or a main board ( BN94-01199B ). However, you'll need to check the wiring on both of these boards. Before this I'll suggest you to callibrate the TV by following these settings--

HI:
This is a plasma unit and philips plasma's are nortorious for bad power supplys, your problem may very well be the power suppy in the television, it is possible you blew a low B+ fuse on the power supply. There is also a issue with the Y-sustain board failing in this model, If you open the back and looking at the unit from the rear the y board is on the left side of the unit and the PS is in the center. disconnect the Y-sustain power plug from the power supply and turn on the unit if the unit stays on with no red light then the y board is bad. it does the same then replace the Power Supply.

I just purchased Samsung series 4 LCD TV yesterday. I had the same problem since my salesman was a kind of stupid. He set the 'Power save mode' to automatic. After fiddle with my TV for a while, I found the solution.
Just change the 'Power save mode' to off, low, normal or high. My LCD TV stopped shifting its brightness.

sure, lcd tvs need to be tweeked depending on the light in the room the darker the worse the picture. so try this
from standard:
picture: 85 to 95 %
brightness: 45% or adjust the black of the video to the black of the pilar bars to equilize them.
color: 32 to 38% or until the flesh tones are not so hot
sharpness: low 10%
tint: always to center
color temp: cool1
back lamp ( if avalible) low when lights are dim, high when lights are bright.
the problem with LCD is they don't look so good with dark sceens. the contast ratio is very low. natively 3000:1 aas compaired to plasma or other direct view TVs. the LCD is back lite and the thin materal of the LCD can not completely block the back light from coming thru. there for the complete "black screen" is illuminated "blue". the best thing is to keep the lights on bright in the room for the best picture.